Double arm spot welder



April 27, 1954 D. BRENT ET AL DOUBLE ARM SPOT WELDEIR Filed Aug. 50,1952 3 Sheets-Sheet l Hill-nil INVENTORS 63. a. BEE/V71: H 6. FOX

' ATTORNEY WELD/Na C/recu/T April 27, 1954 G. D. BRENT ET AL DOUBLE ARMSPOT WELDER 3 Sheets-Sheet 2 Filed Aug. 30, 1952 INVENTORS a; p.Eff/V731 H. .6 F'OX m April 27, 1954 G. D. BR'ENT ET AL DOUBLE ARM SPOTWELDER 3 Sheets-Sheet 3 Filed Aug. 30, 1952 INVENTORS H. 5. FOX 19%ATTORNEY Patented Apr. 27, 1954 DOUBLE ARM SPOT WELDER George D. Brent,Bloomfield, N. J., and Herbert S. Fox, Plover, Wis., assignors toWestinghouse Electric Corporation, East Pittsburgh, Pa., a corporationof Pennsylvania Application August 30, 1952, Serial No. 307,298

8 Claims.

The present invention relates to spot welders and, more particularly, toa double arm spot welder for mounting lamp filaments.

Projector-type lamps, such as the bicycle lamp or hand lantern lamp,generally comprise a parabolical aluminized vitreous reflector having apair of ferrules sealed into the back end, a pair of verticalfilamentary lead-in conductors soldered to said ferrules, a filamentWelded to said conductors and a lens joined to the open end of thereflector to direct the light emitted therefrom either into a spot orflood-light beam pattern.

In the mounting or welding of the filament to the lead-in conductors, itis essential that the filament be secured in the proper location withrespect to the reflector to obtain a proper light center for the lamp.For long life the welds must be uniform and strong.

In the past, the operator, employing a standr ard bench-type welder,would place the lamp reflector assembly in a horizontal cradle locatedin the bottom portion of the welder, with the filament conductorsprojecting vertically upward. The filaments, generally having a. pair ofdepending supports connected and insulated from each other by a glassbead, would then be loaded in a vertical position in an upper nest abovethe reflector assembly. By the operation of one foot pedal, the filamentwould be brought downwardly and the supports aligned with the lead-inconductors of the reflector assembly in the welding position. Theoperator would then grasp a pair of tweezer electrodes in either hand,position them about the filament supports and lead-in conductors, andthen by pressing a second pedal with her other foot she would Weld bothlegs to the conductors simultaneously.

The welding operation required continuous operator motion and handlingof the reflectors and filaments, depended largely upon the individualoperators skill, and resulted in low product subjected to highshrinkage, due to the unsatisfactory performance of the tweezerelectrodes.

Hence, it has been found advantageous, according to our invention, toprovide a double arm spot welder for lamp filament mounting whichreduces the operators effort and handling of the reflector assembly andfilament, automatically sets the light center of the lamp, eliminatesfitting or placing of the filament with respect to the reflectorassembly, increases production, and

reduces shrinkage. This welder consists of a pair of stationary jawsmounted onan anvil pro vided with a bead nest for automatically locatingthe filament position, a pair of movable electrodes insulated from eachother, activated by foot action and fired automatically and successivelyby a welding circuit consisting of a timer, a pair of adjustable powerstats and a pair of transformers to supply adjustable secondary currentto each pair of electrodes, an adjustable locating plate, a V-block fordetermining automatically the light center of the lamp, and means fordriving or activating the movable electrodes: and timer.

To use, the operator places the filament in place in the anvil nest withthe right hand and holds the reflector assembly against the locatingplate and on the V-block with. the left hand. Then, by means of a footpedal, the operator trips the movable jaws toward the stationaryelectrodes, thus successively welding, through the operation of thewelding circuit first one and then the other of the filamentary supportsto said lead-in conductors.

In its general aspect, the present invention has as its object theelimination of the disadvantages and defects of the prior art spotwelders for mounting a lamp filament.

A specific object of the invention is to provide a double arm spotwelder for lamp filament mounting which reduces. the operators effortand handling of the reflector assembly and filament, increasesproduction, reduces shrinkage, automatically locates the lamp lightcenter, and produces uniform strong welds free from operator variations.

Another object is to produce a double arm spot welder for lamp filamentmounting, wherein the operator slides the filament into a nest with herright hand, places the reflector assembly against a light center locatorplate and V-block with her left, and trips the movable electrodesbymeans of a foot pedal, thus automatically welding the filamentsupports to the lead-in conductors successively as controlled by thewelding circuit.

A further object isv to provide a double arm spot welder for lampfilament mounting, comprising a pair of diametrically opposed stationaryelectrodes mounted on an anvil carrying a filament positioning nest, apair of movable electrodes complementary thereto, an adjustable lightcenter locating plate and V-block for positioning the reflector assemblywith respect to the nested filament, foot pedal means for tripping saidmovable electrodes, a welding circuit, for successivelymaking the welds,and means for operating said movable electrodes.

Other objects of the invention will appear to those skilled in the artto which it appertains as the description thereof proceeds, both bydirect recitation thereof and by implication from the context.

Referring to the accompanying drawing in which like numerals ofreference indicate similar parts throughout the several views:

Fig. 1 is a plan view of a double arm spot welder embodying ourinvention for lamp filament mounting;

Fig. 2 is an end elevational view of the welder of Fig. 1, showing theoperating mechanism for the movable electrodes and the welding circuit.

Fig. 3 is an enlarged vertical sectional view on the line III-III ofFig. 2, in the direction of the arrows, showing the upper stationaryelectrode and the lower movable electrode for welding a filament supportto the reflector assembly lead-in conductor.

Fig. 4 is a horizontal sectional view, on the line IV--IV of Fig. 3, inthe direction of the arrows, showing the lower movable electrode, lowerstationary electrode, and the anvil connecting the stationaryelectrodes.

Fig. 5 is a vertical sectional view on the line V-V of Fig. 3 in thedirection of the arrows, showing the filament supports and conductors inthe welding position.

Fig. 6 is a view similar to Fig. 5, showing the reflector assemblylead-in conductors in initial position with respect to the filamentsupports on the anvil.

Fig. '7 is a view similar to Fig. 6 showing the position of the lead-inconductors after rotation in a clockwise direction to their final orwelding position.

Fig. 8 is a vertical sectional view, on the line VIII-VIII of Fig. 1, inthe direction of the arrows, showing the upper electrode shaft andassociated parts.

Referring to the drawing, and particularly Figs. 1 and 2, the referencenumeral I ll designates the double arm spot welder of our invention forlamp filament mounting. This welder consists essen tially of asupporting frame l2 mounted on a horizontal table l4, a light centerlocating plate [6 on the table I4, a pair of diametrically opposed upperand lower stationary electrodes i8 and 20 secured adjacent said plate 4ii on an anvil 22, a lower movable electrode 24, and an upper movableelectrode 26, complementary to the stationary electrodes i8 and 20respectively, an operating mechanism 28 for the movable electrodes 29and 22, and a welding circuit 3!]. The support frame [2 when viewed fromthe left of Figs. 1 and 2, has a D-shaped configuration and is providedwith a straight vertical support 3| near its middle portion and frontand rear vertical members 34 and 33 (Fig. 1). t is mounted by means ofbrackets 32 to the table i l. The conventional welding circuit 30comprises a timer and a pair of adjustable rheostats or power stats toprovide adjustable secondary current thru a pair of transformers to theelectrodes.

Locating plate The light center locating plate It, shown particularly inFig. 2, consists essentially of a vertical plate-like member 3 5provided with a lead-in conductor clearance hole 36 in its upper end andan adjustable positioning stop 36 located on its right side. Member 35is also provided with a V-block as hereinafter described which is formedto fit the outer contour of a parabolic aluminized reflector 31 of areflector assembly 38.

The assembly 38, shown in section in Fig. 4 comprises the reflector 31provided with a. pair of outer ferrules 4D and 4!, an exhaust tubulation42, a pair of angular lead-in conductors 44 and 46 which are soldered tothe ferrules 40 and 4! and a positioning lip 4! on its outer peripheryfor cooperation with the stop 36' on member 35.

The member 35 has on its loading side a V- block having elements 48 and50 (Fig. 2) which extend angularly upwards from a body portion 52. Theblocks are adjustable vertically with respect to member 35 by means of apair of vertical slots in body portion 52. The member 35 is in turnfastened, as by bolts extending through the body portion 52, to a slideplate 5 adjustably mounted on a slide 56 on the table :4.

Anvil and stationary electrodes Adjacent the locating plate [6, oppositeits: loading side, the anvil 22 having a circular filament loadingstation platform 58 (Fig. l), as an extension thereof is adjustablymounted on a bracket 51 adjacent plate 35. This bracket 5! is adjustablysecured and slidable on the plate 56. This anvil 22 has an axial nestcavity E2 of rectangular cross section at its forward end adjacent theplate 16 in which is mounted, by means of volts, a filament button nest64 (Figs. 3 and 4) for automatically positioning a filament assembly 65with respect to the reflector assembly 38.

The filament assembly 66 consists of a pair of angular filament supports68 and m (Fig. 4) with horizontal extremities positioned transverse tothe extremities of conductors 44 and 46. The supports are mounted withrespect to, and insulated from, each other by a vitreous button '12which is accurately located with respect to a filament 14 mounted on thelight-source ends of the supports 68 and 10. The nest 64 has an axialbutton-positioning slot 15 in the end adja cent plate [6, thusautomatically positioning filament 14 at the light center of thereflector assembly 38.

As shown particularly in Fig. 2, the upper stationary electrode i8 ismounted by means of a bracket or electrode-mounting arm 16 (Fig. 3)above and forward of the anvil 22. The underside of the anvil 22directly beneath the brackct or arm 16 is suitably cut away to permitthe passage therethrough of the lower movable elec trode '24 forengagement with the stationary electrode 18. As also shown in Fig. 2,the opposed lower stationary electrode 20 is similarly mounted on theanvil 22 by bracket 13.

It will be understood that the aforementioned filament loading platform58, or continuation of the anvil 22, merely provides convenient filamentassembly storing space for easy movement of the filament assembly 66into the nest 8 3 for filament mounting.

Movable electrodes The lower movable electrode 24, which cooperates withthe stationary electrode l8 (Figs. 1 and 2), is rotatably secured on thewelding end of a lower electrode arm having its other end journalled ona lower electrode arm shaft 332 on the frame I2. The upper movableelectrode 263 is similarly carried on one end of an upper electrode arm84 journalled on an upper electrode shaft 86. The upper shaft 86, asshown in Fig. 1, extends through both sides 33 and 34 and the support 3|ofthe frame 12 and through suitable bushingslocated therein, whereas thelower shaft 62 extends through the front side wall 34 and support 3| offrame l2 and is mounted on bushings therein.

Operating mechanism The operating mechanism 28 for the movableelectrodes .29 and 22 and the welding circuit 39 has in addition to theshafts 82 and 85 and the arms 88 and 84 a bell crank lever 92 (Figs. 2and 8) which is journalled on the shaft as between the support 3i andrear end portion 33 (Fig. l) of the frame 12. Phis lever 92 (Fig. 8) hasa lever spring anchor armt4 adjacent the brackets 32, and a downwardlydepending cam arm 96 which carries a horizontal cam mounting plate 98located intermediate the ends of the arm 96. This plate 98 carries atimer cam I adjustable by means of bolts extending through slotstherein.

Adjacent the cam I80, a pivotable timer cam follower m2 carrying aroller 44 for engagement with the timer cam Hill, is pivotally mountedon a shaft I06 (Fig. l) which is secured in suitable brackets dependingfrom the rearward side of the frame l2. The underside of the timer camfollower I02 rests on a microswitch rod 258 vertically reciprocablethereby in a bushing lit (Fig. 2) on the table 14. This rod E36, when itis moved downwardly by the cam follower E42, closes the welding circuit(indicated by a block diagram in Fig. 2) and causes the timer toenergize the transformers thru the adjustable power stats thus weldingfirst the support 58 to the lead-in conductor 44, both positionedbetween the upper stationary jaw is and the lower movable electrode 24,and then the other filament support It to the lead-in conductor 48 heldbetween the upper movable electrode ft and the lower stationaryelectrode 20.

The lower end of the cam arm $5 of the bell crank lever 92 is secured toa foot pedal cable 522 which extends over a pulley H4, Figs. 1 and 2,mounted on one of the frame brackets 32 and attached to a suitable footpedal (not shown) on the floor beneath the table i4.

As shown in Figs. 1, Z, and 8, a bell crank drive H6 is fixed adjacentlever 82 to the upper shaft 86, as by means of a set screw ill, anddepends downwardly therefrom adjacent the upper portion of the cammounting plate 88. The lower end of the arm H6 is provided with ahorizontal pin H8 (Fig. l) which engages the cam arm 95, moving for alimited distance, with the bell crank lever 92, as the shaft 55 isrotated in a clockwise direction.

Between the bell crank lever 92 and support 53! of the frame l2, springanchor arm E24 is also affixed to the shaft Bi; as by a suitable setscrew I21. The outer end of the arm 25! is joined by means of a tensionspring 122 (Figs. 1 and 2) to the spring anchor arm 94 of the-bell cranklever 92.

Between arm [20 and the front side member 34 of the frame l2, an upperelectrode tensioning arm l24 carrying on its outer extremity a springpin 128 (Figs. 1 and 2) is also fixed to the shaft 86. A tension springI38 extends from an adjustable hook I32 (Fig. 2) in the upper electrodetensioning arm 84 to the spring pin The upper electrode arm 84, ashereinbefore mentioned, is journalled on the shaft between arm I24 andthe front side frame member 34.

156 is fixed to the shaft 86.

A suitable electricaluconnection l34'is provided on the shaft endof thearm 84. As shown in Fig. 1 adjacent the upper arm 84, a drive gear onthe other end of the shaft '86 a shaft-biasing torsion spring 149(Fig. 1) is provided between the vertical side member 33 ofthe frame !2and a suitable collar I42 fixed to said shaft.

As shown particularly in Fig. 2, the drive gear I36 engages a drivengear [44 on the lower shaft 82. Phe lower electrode arm 86 is journalledon the shaft 82, suitablydirectly beneath the upper electrode arm 84 onthe shaft 85. Between the ear H44 and the lower arm a lower electrodedrive arm 146 having on its outer end an electrically insulatedhorizontal pin I48 extending .into the lower arm 80 is fixed to thelower shaft Operation To load the double arm spot welder 10 of ourinvention, the operator moves a filament assembly Bdfrom the loadingplatform 58, by hand or with tweezers, into position on the anvil nestE54 (Fig. 4), so that the top of the button 12 rests against the innerportion of the button-positioning slot 15. With her left hand theoperator holds the reflector assembly 38 against the 10- eating platel5, restingthe bottom portion of the reflector 3'! onthe V-blockelements 48 and 50. The lead-in conductors 44 and 46 are inserted at anangle with respect to the horizontal portions of the filament supports68 and H3, as shown in Fig. 6, so that the conductor 44 is beneathsupport 83 and conductor 46 isabove support in. The assembly 38, andparticularly the part comprising the inner extremities of the conductors58 and 17B, is rotated clockwise'until the lip 41 .of reflector 3'!-strikes stop 36' on member 35 wise swinging of the lever 92 and thespring anchor arm 54 thereon resiliently rotates the shaft 85 clockwiseby means of the spring I22 and spring anchor arm I255. Rotation of theshaft 86 causes the bell crank drive arm H6, upper electrode tensioningarm 124 and hence, by means of the spring I39 (connecting arm l24'toupper arm 84), the arm 84 clockwise. andv upper movable electrode 26 tomove into contact with the Work namely conductor 46 and support it onlower jaw 2&. Continued foot pressure by the operator causes lever 92 torotate further, thereby applyin pressure to the work. It will beunderstood that after electrode 26 contacts the work the horizontal pinH3 (Figs. 1 and 8) breaks contact with the lever arm 98, and the shaft86 ceases its rotation.

Simultaneously, the driven gear I44 on lower shaft 82 is rotatedcounterclockwise by means of drive gear 136 on the upper shaft 85. Thearm 46 on shaft 8-2 and hence the lower welding electrode arm 86, whichis pinned to arm I45, are also rotated counterclockwise. The lowermovable electrode 22 on arm 89 moves upwardly into contact with the worknamelyv support 12 and conductor 44 on the upperstationary electrode I8.

It will be also understood that the clockwise rotation ofthe bell crank.lever.92 hascaused 7 the roller I04 on the end of the cam follower I02to roll over the cam I secured to the cam plate 98 on the bell cranklever depending arm 96, thus movin the timer rod I08 downwardly tosuccessively pass current through first one and then the othertransformer in th welding circuit 30. Secondary current from thetransformers successively passes thru stationary electrode It, the work,and movable electrode 24 and then stationary electrode 20, the work, andupper movable electrode 26, thus welding in succession filament support68 to conductor 44 and support '10 to conductor 46.

As the operator releases the foot pressure on the pedal, (now shown) thetorsion sprin M0 on the rearward end (Fig. 1) of the upper shaft 86returns the upper shaft 86, the lower shaft 82 and the associated partsthereon to their normal or starting position. The operator then re movesthe reflector assembly 38, having the filament assembly 66 mountedthereon, from the eating plate iii of the double arm spot welder Ill.

Although a preferred embodiment of our invention has been disclosed, itwill be understood that modifications may be made within the spirit andscope of the invention.

We claim:

1. A double arm spot welder for mounting a lamp filament assembly havinga pair of filament supports, a filament mounted on said supports and avitreous button for supporting and insulating said supports and locatingsaid filament with respect thereto, on a reflector assembly having areflector and a pair of lead-in conductors mounted thereon, comprising aframe, an adjustable anvil mounted on said frame, on said anvil afilament button nest for positioning said filament assembly at the lightcenter of said refiector assembly, and a pair of diametrically opposedupper and lower stationary electrodes about said nest, a pair ofdiametrically opposed lower and upper movable electrodes for cooperatingwith said stationary electrodes to weld successively one filamentsupport to one conductor and then the other support to the otherconductor, an adjustable light center locating plate on said frameadjacent said anvil for positioning said reflector assembly with respectto a filament nested on said anvil, a welding circuit for successivelymaking said pair of welds, and an operating mechanism on said frame fortripping said movable electrodes onto said pair of filament supports andconductors supported on said lower stationary electrode and said nestand energizing said welding circuit to perform said welds.

2. A double arm spot welder for mounting a lamp filament assembly havinga pair of filament supports, a filament mounted on said supports and avitreous button for supporting and insulating said supports and locatingsaid filament with respect thereto, on a reflector assembly having areflector and a pair of lead-in oonductors mounted thereon, comprising aframe, an adjustable anvil mounted on said frame, on said anvil afilament button nest for positioning said filament assembly at the lightcenter of said reflector assembly, and a pair of diametrically op posedupper and lower stationary electrodes about said nest, a pair ofdiametrically opposed lower and upper movable electrodes for cooperatingwith said stationary electrodes to weld successively one filamentsupport to one conductor and then the other support to the otherconductor, an adjustable light center locating plate on said frameadjacent said anvil for positioning said reflector assembly with respectto a filament nested on said anvil, said light center locating platecomprising a. vertical plate-like member provided with a conductorclearance hole in its upper end and. a V-block formed to fit the outercontour of said reflector, said V-block having a body portion andelements extending angularly upwards from said body portion thereof, aslid ing plate for mounting said body portion and a slide for supportingsaid plate, a welding circuit for successively making said pair ofwelds, and an operating mechanism on said frame for tripping saidmovable electrodes onto said pair of filament supports and conductorssupported on said lower stationary electrode and said nest andenergizing said welding circuit to perform said welds.

3. A double arm spot welder for mounting a lamp filament assembly havinga pair of filament supports, a filament mounted on said supports and avitreous button for supporting and insulating said supports and locatingsaid filament with respect thereto, on a reflector assembly having areflector and a pair of lead-in conductors mounted thereon, comprising aframe, an adjustable anvil mounted on said frame, on said anvil afilament button nest for positioning said filament assembly at the lightcenter of said reflector assembly, and a pair of diametrically opposedupper and lower stationary electrodes about said nest, a pair ofdiametrically opposed lower and upper movable electrodes for cooperatingwith said stationary electrodes to weld succes" r sively one filamentsupport to one conductor and then the other support to the otherconductor, an adjustable light center locating plate on said frameadjacent said anvil for positioning said reflector assembly with respectto a filament nested on said anvil, a welding circuit for successivelymaking said pair of welds, said welding circuit comprising a timer, apair of adjustable power stats for controlling the current to said pairsof electrodes, a pair of transformers for successively supplying saidpairs of electrodes with adjustable secondary current during the weldingcycle as determined by said timer and cam operated means formechanically energizing said timer, said means comprising a reciprocablerod and a cam follower for engagement with said rod and having a rollerfor engagement with said timer cam, and an operating mechanism on saidframe for tripping said movable electrodes onto said pair of filamentsupports and conductors supported on said lower stationary electrode andsaid nest and energizing said welding circuit to perform said welds.

4. A double arm spot welder for mounting a lamp filament assembly havinga pair of filament supports, a filament mounted on said sup ports and avitreous button for supporting and insulating said supports and locatingsaid fila ment with respect thereto, on a reflector assembly having areflector and a pair of lead-in conductors mounted thereon, comprising aframe, an adjustable anvil mounted on said frame, on said anvil afilament button nest for positioning said filament assembly at the lightcenter of said reflector assembly, and a pair of diametrically opposedupper and lower stationary electrodes about said nest, a pair ofdiametrically opposed lower and upper movable electrodes for ccoperatingwith said stationary electrodes to weld successively one filamentsupport to one conductor and then the other support to the otherconductor, an adjustable light center locating plate on said frameadjacent said anvil for positioning said reflector assembly with respectto a filament nested on said anvil, a welding circuit for successivelymaking said pair of welds, and an operating mechanism on said frame fortripping said movable electrodes onto said pair of filament supports andconductors supported on said lower stationary electrode and said nestand en ergizing said welding circuit to perform said welds, saidoperating mechanism comprising on said frame an upper welding arm shaft,and a lower welding arm shaft connected to said upper shaft by means ofgears, on said upper shaft a bell crank lever, a bell crank lever drivearm carrying a pin for engagement with said lever, an upper weldingelectrode tensioning arm, an upper electrode welding arm, a springanchor arm, and a torsion spring for returning said upper shaft to itsnormal position, said bell crank lever comprising a lever spring anchorarm and a downwardly depending cam arm, said cam arm having thereon ahorizontal cam mounting plate provided with an adjustable timer cam andmeans for connecting said cam arm with welder driving means, on saidlower shaft, a lower welding electrode arm and a lower electrode drivearm connected to and insulated from said lower electrode arm, springmeans for connecting said lever spring anchor arm to said spring anchorarm, and spring means for connecting said upper electrode tensioning armto said upper electrode arm.

5. A double arm spot welder for mounting a lamp filament assembly havinga pair of filament supports, a filament mounted on said supports and avitreous button for supporting and insulating said supports and locatingsaid filament with respect thereto, on a reflector assembly having areflector and a pair of lead-in conductors mounted on said frame, onsaid anvil a filament button nest for positioning said filament assemblyat the light center of said reflector assembly, and a pair ofdiametrically opposed upper and lower stationary electrodes about saidnest, a pair of diametrically opposed lower and upper movable electrodesfor cooperating with said stationary electrodes to weld successively onefilament support to one conductor and then the other sup port to theother conductor, an adjustable light center locating plate on said frameadjacent said anvil for positioning said reflector assembly with respectto a filament nested on said anvil, said light center locating platecomprising a vertical plate-like member provided with a conductorclearance hole in its upper end and a V-block formed to fit the outercontour of said reflector, said V-block having a body portion andelements extending angularly upwards from said body portion thereof, asliding plate for mounting said body portion and a slide for sup-portingsaid plate, a welding circuit for successively making said pair ofwelds, said welding circuit comprising a timer, a pair of adjustablepower stats for controlling the current to said pairs of electrodes, apair of transformers for successively supplying said pairs of electrodeswith adjustable secondary current during the welding cycle as determinedby said timer and cam operated means for mechanically energizing saidtimer, said means comprising a reciprocable rod and a cam follower forengagement with said timer cam, and an operating mechanism on said framefor tripping said movable electrodes onto said pair of filament supportsand conductors supported on said lower stationary electrode and saidnest and energizing said welding circuit to perform said welds, saidoperating mechanism comprising on said frame an upper welding arm shaft,and a lower welding arm shaft connected to said upper shaft by means ofgears, on said upper shaft a bell crank lever, a bell crank lever drivearm carrying a pin for engagement with said lever, an upper weldingelectrode tensioning arm, an upper electrode welding arm, a springanchor arm, and a torsion spring for returning said upper shaft to itsnormal position, said bell crank lever comprising lever spring anchorarm and a downwardly depending cam arm, said cam arm having thereon ahorizontal cam mounting plate provided with an adjustable timer cam andmeans for connecting said cam arm with welder driving means, on saidlower shaft, a lower welding electrode arm and a lower electrode drivearm connected to and insulated from said lower electrode arm, springmeans for connecting said lever spring anchor arm to said spring anchorarm, and spring means for connecting said upper electrode tensioning armto said upper electrode arm.

6. A light center locating plate for a double arm spot welder forwelding the filament supports of a filament assembly to the lead-inconductors of a reflector comprising a vertical platelike memberprovided with a conductor clearance hol in its upper end and a V-blockformed to fit the outer contour of said reflector, said V-block having abody portion and elements extending angularly upwards from said bodyportion thereof, a sliding plate for mounting said body portion and aslide for supporting said plate.

7. An operating mechanism for the movable electrodes of a double armspot welder for lamp filament mounting comprising a frame, on said framean upper welding arm shaft, and a lower welding arm shaft connected tosaid upper shaft by means of gears, on said upper shaft, a bell cranklever, a bell crank lever drive arm carrying a pin for engagement withsaid lever, an upper Welding electrode tensioning arm, an upperelectrode welding arm, a spring anchor arm, and a torsion spring forreturning said upper shaft to its normal position, said bell crank levercomprising a lever spring anchor arm and a downwardly depending cam arm,said cam arm having thereon a horizontal cam mounting plate providedwith an adjustable timer cam and means for connecting said cam arm withwelder driving means, on said lower shaft, a lower welding electrode armand a lower electrode drive arm connected to and insulated from saidlower electrode arm, spring means for connecting said lever springanchor arm to said spring anchor arm, and spring means for connectingsaid upper electrode tensioning arm to said upper electrode arm.

8. An anvil for a double arm spot welder for mounting a lamp filamentassembly having a pair of filament supports, a filament mounted thereon,and a vitreous button for supporting and insulating said supports, andlocating said filament with respect thereto, provided with an axialforward nesting cavity and having a filament button nest in said cavity,a filament loading station platform extension at the rear of said anvil,an upper stationary welding electrode mounted on one side of said anvil,a stationary lower electrode mounted on the other side of said anvil,and means for mounting said anvil adjustable in a vertical andhorizontal direction.

No references cited.

